There are lots of system monitors out there, many of them for free. I can see no reason to pay $10 for this one. So it's a widget, big deal! But then, widgets have never excited me. In fact, I can live quite happily without them.
I tried it out and wasn't impressed. Oh, it's all right, but nothing special. Even if were free, I can't see why I'd choose this over any of the others.